US8331341B2 - Base station for transmitting a synchronization signal - Google Patents

Base station for transmitting a synchronization signal Download PDF

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Publication number
US8331341B2
US8331341B2 US12/377,339 US37733907A US8331341B2 US 8331341 B2 US8331341 B2 US 8331341B2 US 37733907 A US37733907 A US 37733907A US 8331341 B2 US8331341 B2 US 8331341B2
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Prior art keywords
synchronization channel
channel
base station
synchronization
filter
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Expired - Fee Related, expires
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US12/377,339
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English (en)
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US20090245229A1 (en
Inventor
Yoshihisa Kishiyama
Motohiro Tanno
Kenichi Higuchi
Mamoru Sawahashi
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NTT Docomo Inc
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NTT Docomo Inc
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Assigned to NTT DOCOMO, INC. reassignment NTT DOCOMO, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HIGUCHI, KENICHI, KISHIYAMA, YOSHIHISA, SAWAHASHI, MAMORU, TANNO, MOTOHIRO
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H04B1/70735—Code identification
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H04L5/0039—Frequency-contiguous, i.e. with no allocation of frequencies for one user or terminal between the frequencies allocated to another
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0042—Intra-user or intra-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH

Definitions

  • the present invention relates to a base station for generating a synchronization channel to transmit to a mobile station.
  • a mobile station performs cell search by means of a downlink physical channel referred to as a SCH (Synchronization Channel).
  • the SCH includes two subchannels: a P-SCH (Primary SCH) and an S-SCH (Secondary SCH) (see “W-CDMA MOBILE COMMUNICATIONS SYSTEM” edited by Keiji Tachikawa, Japan, Mar. 15, 2002, page 112).
  • the P-SCH is used by the mobile station to detect slot timing.
  • the S-SCH is used by the mobile station to detect frame timing and a scrambling code group (spreading code group).
  • the mobile station achieves fast cell search by means of these two SCHs.
  • the P-SCH signal and the S-SCH signal are code-multiplexed in the time domain for transmission.
  • the mobile station despreads the P-SCH signal and the S-SCH signal and separates them. Since the P-SCH signal and the S-SCH signal are code-multiplexed and transmitted at the same timing, they experience the same channel fluctuations. Accordingly, the mobile station can perform synchronous detection of the S-SCH signal using the detected P-SCH signal as a reference signal (pilot signal) upon correlation detection of the S-SCH signal. In this manner, the S-SCH signal is detected with high accuracy.
  • OFDM Orthogonal Frequency Division Multiplexing
  • a wide system band for example, 20 MHz
  • a narrower system band for example, 5 MHz
  • various operators can provide their services.
  • a spectrum in an OFDM radio communication system supporting multiple system bandwidths can be used for OFDM transmission within a system bandwidth (5 MHz) which is less than the maximum system bandwidth (for example, 20 MHz).
  • the base station transmits a synchronization signal on a synchronization channel using the minimum system bandwidth (for example, 1.25 MHz).
  • the minimum system bandwidth for example, 1.25 MHz.
  • a mobile station can receive the synchronization signal without predetermined information about the system bandwidth of the base station to which the mobile station attempts to connect. In other words, the mobile station can always receive the synchronization signal on the synchronization channel with the minimum system bandwidth.
  • the synchronization signal When the synchronization signal is transmitted with the minimum system bandwidth, there is unused transmission bandwidth for a base station with a wider system band. When the unused transmission bandwidth is used for a channel other than the synchronization channel, it is necessary to reduce interference with the synchronization channel in each mobile station.
  • a base station for transmitting a synchronization signal on a synchronization channel with a system bandwidth which is less than the maximum system bandwidth in a radio communication system supporting multiple system bandwidths, including:
  • a multiplexing unit configured to multiplex the synchronization channel and a channel other than the synchronization channel based on a characteristic of a reception filter used in a mobile station.
  • reception quality of a synchronization channel in a mobile station can be improved.
  • FIG. 1 shows a spectrum in an OFDM radio communication system supporting multiple system bandwidths.
  • FIG. 2 shows a characteristic of a filter.
  • FIG. 3 shows a diagram in which a synchronization channel and other channels are multiplexed in accordance with a first embodiment of the present invention.
  • FIG. 4 shows a diagram in which a synchronization channel and other channels are multiplexed in accordance with a second embodiment of the present invention.
  • FIG. 5 shows a diagram in which a synchronization channel and other channels are multiplexed in accordance with a third embodiment of the present invention.
  • FIG. 6 shows a diagram in which a synchronization channel and other channels are multiplexed in accordance with a fourth embodiment of the present invention.
  • FIG. 7 shows a structure of a base station in accordance with an embodiment of the present invention.
  • a “pass band” refers to a frequency band within which signals pass through the filter.
  • a “stop band” refers to a frequency band within which signals are rejected by the filter.
  • a “transition band” refers to a frequency band between the pass band and the stop band. It is ideal to use a filter without the transition band, which is referred to as an ideal filter.
  • the base station places the synchronization channel and the data channels on continuous subcarriers. Multiplexing the synchronization channel and the data channels in this manner allows for efficient use of frequency resources. On the contrary, the cost of the mobile station may increase because of the need for a filter with narrower transition bands in order to eliminate interference with the data channels.
  • guard bands are assigned to transition bands of the reception filter in the mobile station. Specifically, subcarriers corresponding to the transition bands are not used.
  • guard bands to multiplex the synchronization channel and the data channels allows the mobile station to use a filter with wider transition bands (a filter with gradual or gentle cut-off or a filter with a smaller tap number).
  • cyclic prefixes are assigned to transition bands of the reception filter in the mobile station. Specifically, a cyclic prefix CP 1 in a lower frequency component is generated using a copy of a signal SCH 1 in a higher frequency component within the synchronization channel bandwidth. Similarly, a cyclic prefix CP 2 in a higher frequency component is generated using a copy of a signal SCH 2 in a lower frequency component within the synchronization channel bandwidth.
  • Assigning cyclic prefixes in this manner allows the mobile station to combine the cyclic prefix CP 1 in the lower frequency component and the signal SCH 1 in the higher frequency component within the synchronization channel bandwidth after filtering to reproduce the original signal SCH 1 .
  • it allows the mobile station to combine the cyclic prefix CP 2 in the higher frequency component and the signal SCH 2 in the lower frequency component within the synchronization channel bandwidth after filtering to reproduce the original signal SCH 2 . Accordingly, downsampling in the mobile station is easily achieved.
  • both the base station and the mobile station use Root-Nyquist filters with the same characteristic.
  • the characteristic of the transmission filter is multiplied with that of the reception filter, the characteristic of the reception filter in the third embodiment can be derived. Accordingly, the base station can assign cyclic prefixes as described above and multiplex the synchronization channel and the data channels.
  • FIG. 7 shows a base station 10 for implementing the aforementioned embodiments.
  • the base station 10 includes a synchronization channel generating unit 101 , a data channel generating unit 103 , a multiplexing unit 105 , and a transmission filter 107 .
  • the transmission filter 107 need not be included in the base station 10 to implement the first through third embodiments.
  • the synchronization channel generating unit 101 generates timing information or the like which has to be detected by all the mobile stations.
  • the data channel generating unit 103 generates data to be transmitted to the mobile station.
  • the multiplexing unit 105 multiplexes a synchronization channel and a data channel.
  • the multiplexing unit 105 places the synchronization channel on subcarriers corresponding to the minimum system bandwidths, such that the mobile stations can receive the synchronization signal on the synchronization channel without predetermined information about the system bandwidth of the base station.
  • the multiplexing unit 105 further places the data channel on subcarriers other than the subcarriers used for the synchronization channel. Upon placing the data channel, the multiplexing unit 105 may assign a guard band or a cyclic prefix.
  • the characteristic of the transmission filter 107 is adapted to that of the reception filter.
  • the base station may multiplex the synchronization channel and any channel other than the synchronization channel.
  • the base station may multiplex the synchronization channel and a control channel.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
US12/377,339 2006-08-22 2007-08-13 Base station for transmitting a synchronization signal Expired - Fee Related US8331341B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2006225921A JP4745168B2 (ja) 2006-08-22 2006-08-22 基地局
JP2006-225921 2006-08-22
PCT/JP2007/065826 WO2008023599A1 (en) 2006-08-22 2007-08-13 Base station

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US20090245229A1 US20090245229A1 (en) 2009-10-01
US8331341B2 true US8331341B2 (en) 2012-12-11

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US (1) US8331341B2 (de)
EP (1) EP2056501A4 (de)
JP (1) JP4745168B2 (de)
KR (1) KR20090045241A (de)
CN (1) CN101507160A (de)
AU (1) AU2007288915B2 (de)
BR (1) BRPI0715854A2 (de)
RU (1) RU2438248C2 (de)
TW (1) TW200820804A (de)
WO (1) WO2008023599A1 (de)

Citations (6)

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JP2001144722A (ja) 1999-03-02 2001-05-25 Matsushita Electric Ind Co Ltd Ｏｆｄｍ送受信装置
JP2003309533A (ja) 2002-04-17 2003-10-31 Matsushita Electric Ind Co Ltd 無線送信装置、無線受信装置及びその方法
WO2005109709A1 (ja) 2004-05-06 2005-11-17 Matsushita Electric Industrial Co., Ltd. マルチキャリア送信装置、マルチキャリア受信装置、マルチキャリア送信方法およびマルチキャリア受信方法
WO2006092852A1 (ja) 2005-03-02 2006-09-08 Fujitsu Limited Ｏｆｄｍ通信システム及びｏｆｄｍ通信方法
US20060227908A1 (en) * 2005-04-07 2006-10-12 Scharf Louis L Advanced signal processors for interference cancellation in baseband receivers
US20070183391A1 (en) * 2006-02-08 2007-08-09 Hidenori Akita Method and apparatus for interleaving sequence elements of an OFDMA synchronization channel

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DE4330672A1 (de) * 1993-09-10 1995-03-16 Thomson Brandt Gmbh Verfahren zur ]bertragung von digitalisierten Fernseh- und/oder Tonrundfunksignalen
US5991330A (en) * 1997-06-27 1999-11-23 Telefonaktiebolaget L M Ericsson (Pub1) Mobile Station synchronization within a spread spectrum communication systems
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JP2001144722A (ja) 1999-03-02 2001-05-25 Matsushita Electric Ind Co Ltd Ｏｆｄｍ送受信装置
JP2003309533A (ja) 2002-04-17 2003-10-31 Matsushita Electric Ind Co Ltd 無線送信装置、無線受信装置及びその方法
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EP1496632A1 (de) 2002-04-17 2005-01-12 Matsushita Electric Industrial Co., Ltd. Funksendervorrichtung, funkempfängervorrichtung und verfahren dafür
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US20060227908A1 (en) * 2005-04-07 2006-10-12 Scharf Louis L Advanced signal processors for interference cancellation in baseband receivers
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Also Published As

Publication number Publication date
RU2009108208A (ru) 2010-09-27
AU2007288915A1 (en) 2008-02-28
US20090245229A1 (en) 2009-10-01
RU2438248C2 (ru) 2011-12-27
TWI360973B (de) 2012-03-21
CN101507160A (zh) 2009-08-12
BRPI0715854A2 (pt) 2013-07-23
JP2008053861A (ja) 2008-03-06
EP2056501A1 (de) 2009-05-06
JP4745168B2 (ja) 2011-08-10
KR20090045241A (ko) 2009-05-07
EP2056501A4 (de) 2013-10-30
TW200820804A (en) 2008-05-01
AU2007288915B2 (en) 2012-08-09
WO2008023599A1 (en) 2008-02-28

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